Vouch Request: nikhilgupta58 #3652

What I want to work on

Fix for issue #3292 — OTLP nanosecond timestamp overflow in the webapp event repository.

Several functions in apps/webapp/app/v3/eventRepository/common.server.ts and apps/webapp/app/v3/runEngineHandlers.server.ts multiply epoch milliseconds by 1_000_000 before converting to BigInt, causing IEEE 754 precision loss (~256ns errors). The correct pattern (BigInt(ms) * BigInt(1_000_000)) already exists in convertDateToNanoseconds() in the same file.

The fix is 4 targeted lines across 2-3 files. I have already prepared the implementation and a .server-changes entry per CONTRIBUTING.md.

Background

I'm an active open source contributor. I recently contributed to calcom/cal.diy:

• PR #29400: fix unknown rescheduleUid returning 200 instead of 404
• PR #29401: fix OTP digit visibility regression in light-theme embed

Both PRs are under review. I follow the full contribution workflow: senior engineer review, CONTRIBUTING.md compliance, and CodeRabbit feedback addressed before marking ready for review.

Issue

Fixes #3292